Set clippy lints in workspace (requires rust 1.74) (#2390)

We currently use a bit of a hack in `.cargo/config` to make sure that
clippy isn't too annoying by specifying the list of lints.

There is now a stable way to define lints for a workspace. The only down
side is that every crate seems to have to opt into this so there's a
*few* files modified in this PR.

Dependencies:

- [x] PR that upgrades CI to use rust 1.74 is merged.

---------

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Branislav Kontur <bkontur@gmail.com>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>

.gitlab/pipeline/check.yml

@@ -4,8 +4,10 @@ cargo-clippy:
     - .docker-env
     - .common-refs
     - .pipeline-stopper-artifacts
+  variables:
+    RUSTFLAGS: "-D warnings"
   script:
-    - SKIP_WASM_BUILD=1 env -u RUSTFLAGS cargo clippy --all-targets --locked --workspace
+    - SKIP_WASM_BUILD=1 cargo clippy --all-targets --locked --workspace
 
 check-try-runtime:
   stage: check